相界面浓度输运方程在一维两流体模型中的应用研究

Study on the Application of Interfacial Area Transport Equation in One-dimensional Two-fluid Model

为解决一维两流体模型核电厂系统分析程序中使用流型图所带来的缺陷,提高系统分析程序计算的准确性,探索在一维两流体模型中应用相界面浓度输运方程(IATE)对两相流动进行预测。采用FORTRAN语言开发耦合了IATE的一维两流体模型求解器(Solver-IATE),并对其进行验证。基于Solver-IATE对小直径绝热圆管内向上泡状流进行了数值模拟,并与采用流型图的计算结果进行了对比。研究结果表明:采用IATE计算的相界面浓度结果比采用流型图的计算结果更接近实验值。因此,在一维两流体模型中使用IATE可以提高其计算相界面浓度的准确性,进而提高一维两流体模型核电厂系统分析程序计算两相间相互作用项的准确性,能更准确预测反应堆的瞬态响应特性。

In order to resolve the drawbacks of flow regime map used in the one-dimensional two-fluid model based nuclear power plant system analysis code and improve the accuracy of the system analysis code,this paper explores the application of the interfacial area transport equation(IATE)in the one-dimensional two-fluid model to predict the two-phase flow.The one-dimensional two-fluid model solver coupled with IATE(Solver-IATE)is developed and verified with FORTRAN.The numerical simulation of upward bubbly flow in the small adiabatic circular tube is conducted based on Solver-IATE,and the results are compared with the simulational results from the flow regime map.The study shows that the phase interfacial area concentration results calculated using IATE are closer to the experimental value than that using the flow regime map.Thus,the application of IATE in the one-dimensional two-fluid model can improve the accuracy of the calculation of phase interfacial area concentration,thereby improving the accuracy of onedimensional two-fluid model based nuclear power plant system analysis code in calculating interaction terms between two phases and more accurately predicting the transient response characteristics of reactor.